Southern Pacific No. 4400 was the railroad's first 4-8-4, erected in 1930 by the Baldwin Locomotive Works. Styled as class GS-1, for "Golden State," these first SP 4-8-4s were oil-burners. They had 73½-inch drivers, 27x80-inch cylinders, and 250 p.s.i. of boiler pressure. Weighing 448,400 pounds, they produced 63,230 pounds of tractive force. They had 4858 square feet of evaporative heating surface, 2565 square feet of superheater surface, and slightly more than 90 square feet of grate area. No information is available concerning the responsible photographer, but this postcard image acquired via eBay was taken at Oakland, California on September 2, 1935.